CN115101296A - A dry-type transformer - Google Patents

Abstract

The invention discloses a dry-type transformer, which comprises a transformer body (1), radiating fins (2), a cross flow fan (3) and a control device (4), wherein the cross flow fan comprises a first shell (31), a second shell (32) and a cross flow impeller (33), and is characterized in that: the second shell comprises a first inclined wall (321), a first arc-shaped part (322), a second arc-shaped part (323) and a second inclined wall (324) which are sequentially connected, a backflow area is formed between the first arc-shaped part and the outer peripheral surface of the cross flow impeller, an auxiliary rotating wheel (34) is installed in the backflow area, an auxiliary air inlet channel (325) is formed in the bottom of the first arc-shaped part, and the auxiliary air inlet channel is communicated with a space among the backflow area, the first inclined wall and the second inclined wall. The invention can promote the air flow to flow back and increase the air inflow, thereby improving the output air quantity of the crossflow fan and improving the cooling effect of the dry-type transformer.

Description

A dry-type transformer

technical field

The invention relates to the technical field of transformers and dry-type transformers, in particular to a dry-type transformer.

Background technique

The cooling methods of dry-type transformers usually include natural cooling and forced cooling. Forced cooling usually adopts cooling fans (cross-flow fans, axial fans) to dissipate heat. As shown in FIG. 1, the existing dry-type transformer includes a transformer body 1, a heat sink 2, a cross-flow fan 3, and a control device 4. The transformer body 1 is provided with a heat sink 2 around it, and the heat sink 2 is provided with a cross-flow fan. 3. A control device 4 is provided on the side of the heat sink 2. The cross-flow fan 3 includes a first casing, a second casing, and a cross-flow impeller. The cross-flow impeller is installed in the impeller cavity formed by the first casing and the second casing. . However, the existing cross-flow fans have the problems of large air volume loss and high noise caused by backflow.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the deficiencies in the prior art, and provide a dry-type transformer, which can promote the backflow of the return air flow and increase the intake air volume through the design of the auxiliary runner and the auxiliary air intake passage, thereby improving the The output air volume of the cross-flow fan improves the cooling effect of the dry-type transformer. Through the design of the adjustable wall and the noise reduction cavity, it can have good diversion and noise reduction effects on the airflow, thereby reducing the air volume loss and noise of the cross-flow fan.

In order to achieve the above object, the technical scheme adopted in the present invention is:

A dry-type transformer, comprising a transformer body (1), a heat sink (2), a cross-flow fan (3), and a control device (4). A control device is provided on the side of the cross-flow fan (3), and the cross-flow fan (3) includes a first casing (31), a second casing (32), and a cross-flow impeller (33). The impeller cavity formed is characterized in that: the second casing comprises a first inclined wall (321), a first arc-shaped part (322), a second arc-shaped part (323), and a second inclined wall (324) which are connected in sequence. ), the first inclined wall and the second inclined wall are inclined relative to the horizontal line, the angle between the first inclined wall and the second inclined wall is 0-30°, and the first arc-shaped part is convex toward the side away from the cross-flow impeller The second arc-shaped portion protrudes toward the side close to the cross-flow impeller, and a recirculation area is formed between the first arc-shaped portion and the outer peripheral surface of the cross-flow impeller, and an auxiliary runner (34) is installed in the recirculation area. The auxiliary motors are connected, and an auxiliary air intake passage (325) is opened at the bottom of the first arc portion, and the auxiliary air intake passage communicates with the return area and the space between the first inclined wall and the second inclined wall.

Further, an arc-shaped transition part (326) is provided between the first arc-shaped part (322) and the second arc-shaped part (323), and the arc-shaped transition part is the same as the center of the cross flow impeller (33), which can be more Good to promote the return of airflow.

Further, the cross-flow impeller (33) rotates clockwise, and the auxiliary runner (34) also rotates clockwise.

Further, the second housing (32) includes a horizontal wall (311), a vertical wall (312), an arc-shaped protrusion (314), and a first arc-shaped wall (313) connected in sequence, and the horizontal wall is connected to the An air inlet channel is formed between the first inclined walls, an air outlet channel is formed between the first arc-shaped wall and the second inclined wall, and an adjustable wall (35) is provided at the corner of the connection between the horizontal wall and the vertical wall. A noise reduction cavity (36) is formed between the wall and the horizontal wall and the vertical wall, and a plurality of communication holes (352) are arranged on the adjustable wall. , the adjustable wall is an arc guide wall.

Further, one end of the adjustable wall (35) is provided with a pivot portion (351), the pivot portion is connected to the inner side of the horizontal wall (311), and the adjustable wall can be rotated by a certain angle under the drive of the pivot portion .

Further, the arc-shaped convex portion (314) is convex relative to the vertical wall (312) toward the side close to the cross-flow impeller (33), and the gap between the arc-shaped convex portion and the outer peripheral surface of the cross-flow impeller is a cross-flow impeller. The minimum gap between the outer peripheral surface of the impeller and the first casing (31); in the first position, the adjustable wall (35) abuts against the vertical wall, and in the second position, the adjustable wall and the arc-shaped protrusion There is a space between the parts.

Further, the pivot portion (351) is connected to an electric drive device or a manual rotation positioning device.

In the dry-type transformer of the present invention, the design of the auxiliary runner and the auxiliary air intake channel can promote the backflow of the return air flow and increase the intake air volume, thereby increasing the output air volume of the cross-flow fan and improving the cooling of the dry-type transformer. Effect. Through the design of the adjustable wall and the noise reduction cavity, it can have good diversion and noise reduction effects on the airflow, thereby reducing the air volume loss and noise of the cross-flow fan.

Description of drawings

1 is a schematic structural diagram of a dry-type transformer in the prior art;

Fig. 2 is the structural schematic diagram of the cross-flow fan of the present invention;

3 is a schematic structural diagram of a cross-flow fan of the present invention;

FIG. 4 is a schematic structural diagram of the cross-flow fan of the present invention.

In the figure: transformer body 1, heat sink 2, cross-flow fan 3, control device 4, first casing 31, second casing 32, cross-flow impeller 33, auxiliary runner 34, adjustable wall 35, noise reduction cavity 36, Horizontal wall 311, vertical wall 312, first arc wall 313, arc protrusion 314, first inclined wall 321, first arc 322, second arc 323, second inclined wall 324, auxiliary The intake passage 325, the arc-shaped transition portion 326, the pivot portion 351, the communication hole 352, and the airflow direction "→".

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments These are some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

The present invention will be further described in detail below in conjunction with the accompanying drawings.

As shown in Figures 2-4, a dry-type transformer includes a transformer body 1, a heat sink 2, a cross-flow fan 3, and a control device 4. The transformer body 1 is provided with heat sinks 2 around it, and the heat sink 2 is provided with cross-flow fans. Fan 3, a control device 4 is provided on the side of the heat sink 2, the cross-flow fan 3 includes a first casing 31, a second casing 32, a cross-flow impeller 33, and the cross-flow impeller 33 is installed on the first casing 31 and the second casing. In the impeller cavity formed by 32, it is characterized in that: the second casing 32 includes a first inclined wall 321, a first arc-shaped portion 322, a second arc-shaped portion 323, and a second inclined wall 324, which are connected in sequence. The wall 321 and the second inclined wall 324 are inclined relative to the horizontal line, the angle between the first inclined wall 321 and the second inclined wall 324 is 5-10° (preferably 7-8°), and the first arc-shaped portion 322 The second arc-shaped portion 323 protrudes toward the side away from the cross-flow impeller 33, and the second arc-shaped portion 323 protrudes toward the side close to the cross-flow impeller 33. A backflow area is formed between the first arc-shaped portion 322 and the outer peripheral surface of the cross-flow impeller 33. An auxiliary runner 34 is installed, and the auxiliary runner 34 is connected with the auxiliary motor. The bottom of the first arc-shaped portion 322 is provided with an auxiliary air intake channel 325. The auxiliary air intake channel 325 communicates with the return area, the first inclined wall 321 and the second Space between inclined walls 324.

The auxiliary runner 34 rotates under the drive of the auxiliary motor, and the backflow of the air outlet of the cross-flow impeller 33 smoothly flows back under the action of the auxiliary runner 34, which can increase a part of the intake air volume.

In a dry-type transformer of the present invention, through the design of the auxiliary runner 34 and the auxiliary air intake channel 325, the backflow (return) air flow can be promoted and the air intake volume can be increased, so that the output air volume of the cross-flow fan can be increased, and the dry-type transformer can be improved. cooling effect of the transformer.

Further, an arc-shaped transition portion 326 is disposed between the first arc-shaped portion 322 and the second arc-shaped portion 323 , and the arc-shaped transition portion 326 has the same center as the cross-flow impeller 33 , which can better promote the backflow of the airflow.

Further, the cross-flow impeller 33 rotates clockwise, and the auxiliary runner 34 also rotates clockwise. In some non-recommended embodiments, due to the difference in size and clearance, the auxiliary runner 34 may also be configured to rotate counterclockwise.

Further, the second housing 32 includes a horizontal wall 311 , a vertical wall 312 , an arc-shaped convex portion 314 , and a first arc-shaped wall 313 connected in sequence, and an air inlet channel is formed between the horizontal wall 311 and the first inclined wall 321 , an air outlet channel is formed between the first arc-shaped wall 313 and the second inclined wall 324, an adjustable wall 35 is provided at the corner of the connection between the horizontal wall 311 and the vertical wall 312, and the adjustable wall 35 is connected to the horizontal wall 311, vertical A noise reduction cavity 36 is formed between the straight walls 312, and a plurality of communication holes 352 are provided on the adjustable wall 35. One end of the communication holes 352 communicates with the outer peripheral area of the cross-flow impeller 33, and the other end communicates with the noise reduction cavity 36. The adjustable wall 35 is arc-shaped. diversion wall.

A dry-type transformer of the present invention can have good diversion and noise reduction effects on the airflow through the design of the adjustable wall 35 and the noise reduction cavity 36, thereby reducing the air volume loss of the cross-flow fan and reducing noise.

Further, one end of the adjustable wall 35 is provided with a pivot portion 351, the pivot portion 351 is connected to the inner side of the horizontal wall 311, and the adjustable wall 35 can be rotated by a certain angle under the drive of the pivot portion 351, so that the guide can be adjusted. Streaming, noise reduction effects.

Further, the arc-shaped convex portion 314 protrudes toward the side close to the cross-flow impeller 33 relative to the vertical wall 312, and the gap between the arc-shaped convex portion 314 and the outer peripheral surface of the cross-flow impeller 33 is the outer peripheral surface of the cross-flow impeller 33 and the first A minimum gap between the housings 31; in the first position, the adjustable wall 35 abuts against the vertical wall 312, and in the second position, there is a distance between the adjustable wall 35 and the arc-shaped protrusion 314.

Further, the pivot portion 351 is connected to an electric drive device or a manual rotation positioning device.

In a dry-type transformer of the present invention, through the design of the auxiliary runner 34 and the auxiliary air intake channel 325, the backflow (return) air flow can be promoted and the air intake volume can be increased, so that the output air volume of the cross-flow fan can be increased, and the dry-type transformer can be improved. cooling effect of the transformer. Through the design of the adjustable wall 35 and the noise reduction cavity 36, it can have good diversion and noise reduction effects on the airflow, thereby reducing the air volume loss and noise of the cross-flow fan.

The above-mentioned embodiment is an illustration of the present invention, not a limitation of the present invention. It can be understood that various changes, modifications, replacements and modifications can be made to these embodiments without departing from the principle and spirit of the present invention. The protection scope of the present invention It is defined by the appended claims and their equivalents.

Claims (7)

1. A dry-type transformer, comprising a transformer body (1), a heat sink (2), a cross-flow fan (3), and a control device (4), a heat-dissipating fin is arranged around the transformer body, and a cross-flow fan is arranged on the heat-dissipating fin, A control device is provided on the side of the heat sink, and the cross-flow fan (3) includes a first casing (31), a second casing (32), and a cross-flow impeller (33), and the cross-flow impeller is installed on the first casing and the second casing. In the impeller cavity formed by the body, it is characterized in that: the second casing comprises a first inclined wall (321), a first arc-shaped part (322), a second arc-shaped part (323), and a second inclined wall which are connected in sequence. (324), the first inclined wall and the second inclined wall are inclined with respect to the horizontal line, the included angle between the first inclined wall and the second inclined wall is 0-30°, and the first arc-shaped part is directed away from the cross-flow impeller. The side protrudes, the second arc portion protrudes toward the side close to the cross-flow impeller, a backflow area is formed between the first arc-shaped portion and the outer peripheral surface of the cross-flow impeller, and an auxiliary runner (34) is installed in the backflow area, and the auxiliary rotor The wheel is connected to the auxiliary motor, and an auxiliary air inlet passage (325) is opened at the bottom of the first arc portion, and the auxiliary air inlet passage communicates with the return area and the space between the first inclined wall and the second inclined wall. 2. The dry-type transformer according to claim 1, wherein an arc-shaped transition portion (326) is provided between the first arc-shaped portion (322) and the second arc-shaped portion (323), The arc-shaped transition part has the same center as the cross-flow impeller (33), which can better promote the backflow of the airflow. 3 . The dry-type transformer according to claim 2 , wherein the cross-flow impeller ( 33 ) rotates clockwise, and the auxiliary runner ( 34 ) also rotates clockwise. 4 . 4. A dry-type transformer according to claim 3, characterized in that, the second casing (32) comprises a horizontal wall (311), a vertical wall (312), and an arc-shaped convex portion connected in sequence (314), a first arc-shaped wall (313), an air inlet channel is formed between the horizontal wall and the first inclined wall, an air outlet channel is formed between the first arc-shaped wall and the second inclined wall, and the horizontal wall and the vertical wall are formed. An adjustable wall (35) is arranged at the corner of the connection, a noise reduction cavity (36) is formed between the adjustable wall, the horizontal wall and the vertical wall, and a plurality of communication holes (352) are arranged on the adjustable wall. One end is connected to the outer peripheral area of the cross-flow impeller (33), the other end is connected to the noise reduction cavity, and the adjustable wall is an arc-shaped guide wall. 5. The dry-type transformer according to claim 4, characterized in that, a pivot portion (351) is provided at one end of the adjustable wall (35), and the pivot portion is connected to the inner side of the horizontal wall (311). , the adjustable wall can be rotated by a certain angle under the drive of the pivot part. 6 . The dry-type transformer according to claim 5 , wherein the arc-shaped convex portion ( 314 ) protrudes toward the side close to the cross-flow impeller ( 33 ) relative to the vertical wall ( 312 ), 6 . The gap between the arc-shaped protrusion and the outer peripheral surface of the cross-flow impeller is the minimum gap between the outer peripheral surface of the cross-flow impeller and the first casing (31); in the first position, the adjustable wall (35) is in contact with the vertical wall Then, in the second position, there is a distance between the adjustable wall and the arc-shaped protrusion. 7 . The dry-type transformer according to claim 6 , wherein the pivot portion ( 351 ) is connected to an electric drive device or a manual rotation positioning device. 8 .

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